As there can be some time between build date and first sale, I am just not sure as of when the car ran off the plant

Because when it is one of the first built MY2017, it may be the latest MY2017 can have different hardware (due to issue feedback and quality improvements by JLR during a year)?
Just my thoughts on complete new cars to the market within the first 3 years.

RockhopperJ, has the dealer said they will be loading ACP and AA as it's a bit hit and miss amongst dealers whether they are going to add this new feature - at all, for free or for a charge!

@Jim - Turns out they want to charge me £200 for the privilege of having ACP/AA added so will not now be doing it for free even as a gesture of goodwill due to initial problems with the vehicle prior to delivery. Will give it miss for now and see if I can get it added at some point in the future, perhaps at first service.

SwiftPaws the VIN is allocated as the car runs down the production line, not at first registration, which is when the Reg No is allocated.

If you can compare the last 6 digits with other MY17 cars it may be possible to identify when it rolled down the line. Comparing just the first 2 (or possibly 3) digits of the last 6 as it as probably best not to publish all 6 on a public forum.

My Sept 2016 build MY17 has a last 6 of 08xxxx if this is of any help.